The Effect of Catalytic Ozonation on the Natural Organic Matter Structure and Trihalomethane Formation Potential

Öz

Oxidation by-products (OBP) are formed as a result of the reaction of natural organic matter (NOM) in the aquatic environment, which cannot be removed sufficiently by conventional treatment processes, with chlorine used for disinfection/oxidation. The reactions between NOM and ozone depend on the physicochemical properties of the natural organic matter, such as aliphaticity and aromaticity. In this study, trihalomethanes, which are formed as a result of catalytic ozonation of humic acid solutions representing natural organic substances in surface water resources, were qualitatively determined by gas chromatography-mass detector and the structural change of oxidized organic substances was followed. At neutral pH levels of 10 mg / L natural organic matter, 10 mg / L dissolved ozone and 0.050 g / L catalyst use for 15 minutes. In the end, it was determined that it caused a change of 76.00%, 32.48%, 21.32%, 3.49%, and 52-62% in DOC, UV220, UV254, UV272, and TTHM, respectively. As a result, it has been determined that catalytic ozonation transforms its aromatics into aliphatic by disrupting the bond structure of natural organic matter and reduces the formation of disinfection by-products by oxidizing some of it to the final product.

Anahtar Kelimeler

• Natural Organic Matter
• Catalytic Ozonation
• Oxidation By Products
• Aliphatic
• Aromatic
• Trihalomethanes

Katalitik Ozonlanmanın Doğal Organik Maddenin Yapısına ve Trihalometan Oluşturma Potansiyeline Etkisi

Öz

Konvansiyonel arıtma prosesleri ile yeterli oranda giderilemeyen sucul ortamdaki doğal organik maddenin (DOM) dezenfeksiyon/oksidasyon amacıyla kullanılan klorla reaksiyona girmesi sonucunda oksidasyon yan ürünleri (OYÜ) oluşmaktadır. DOM ile ozon arasındaki reaksiyonlar doğal organik maddenin alifatikliği ve aromatikliği gibi fiziko kimyasal özelliklerine bağlıdır. Bu çalışmada yüzey su kaynaklarındaki doğal organik maddeleri temsil eden humik asit çözeltilerinin katalitik ozonlanması sonucunda oluşan oksidasyon yan ürünlerinden trihalometanlar gaz kromatografi kütle dedektörü vasıtasıyla kalitatif olarak tespit edilmiş ve okside olmuş organik maddelerin yapısal değişimi takip edilmiştir. 10 mg/L doğal organik maddenin nötral pH seviyelerinde 10 mg/L çözünmüş ozon ile birlikte 0,050 g/L katalizör kullanımında 15 dk. sonunda ÇOK, UV220, UV254, UV272 ve TTHM’de sırasıyla %76,00, %32,48, %21,32, %3,49 ve %52-62 değişim meydana getirdiği belirlenmiştir. Sonuç olarak katalitik ozonlamanın doğal organik maddenin bağ yapsını bozarak aromatiğini alifatiğe dönüştürdüğü ve bir kısmını son ürüne okside ederek dezenfeksiyon yan ürünü oluşumunu azalttığı tespit edilmiştir.

Anahtar Kelimeler

• Doğal organik madde
• Katalitik ozonlanma
• Oksidasyon yan ürünleri
• Alifatik
• Aromatik
• Trihalometanlar

Kaynakça

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